Chickenpox can be contagious in the last 2 days of the incubation period. Most clinical children with chickenpox often have fever, malaise, anorexia, headache, and occasional diarrhea 1-2 days before rash onset, and symptoms disappear 2-4 days after rash onset usually lasting 1-6 days, with self-limiting. Immunocompromised children and adults are susceptible to heavy chickenpox with a long duration of illness. Clinical symptoms include chills, fever, headache, sore throat, nausea, vomiting and other gastrointestinal symptoms, occasionally accompanied by serious complications, such as secondary bacterial infections and sepsis. The transmission of chickenpox is respiratory and close contact transmission. In the early stage of infection, the rash of chickenpox patients has not yet formed herpes, so the mode of infection is only respiratory transmission, and the virus exists in the droplets of breathing, and it is possible to be contagious during this time if the symptoms of coughing appear. However, because there is no herpes, we cannot know whether we have chickenpox or not, and we cannot confirm the diagnosis soon. Therefore chickenpox is potentially contagious during the incubation period, only the incubation period can be 10 to 24 days, with an average of 14 to 16 days, which is a long time, so it may take half a month to know if you are infected after you have just been in contact with a chickenpox patient.